近年來石墨烯被發現表面電漿共振化後有非常特異的現象，此現象能有助於提升太陽能電池中的光電流，這是因為此效應具有非常優異的載子移動率、高光吸收率、可調變的共振波長、較長的電子存活時間(long lifetime)、於介面處載子傳輸快速;在染料敏化太陽能電池中，染料是提升光吸收波段的角色，但染料本身在使用上有許多環境上的限制與高成本的問題，根據上述染料敏化太陽能電池的缺點，擁有能自由調整能隙、優異的電子遷移率、高穩定化學性質的石墨烯似乎是種有潛力的材料能取代染料進而提升整體光電轉化效率。根據上述的現象，我們能利用石墨烯電漿化後的性質轉換太陽光能量，本研究中我們將利用奈米金屬粒子電漿共振化後調整石墨烯的能帶結構，使得石墨烯成為一種光敏化的材料，接著我們再利用此特性與不同二氧化鈦材料合成光電極並組合成一個完整的迴路進行光分解水產氫效率的研究

Recently, surface plasmon resonance was discovered on the graphene. Surface plasmon resonance is utilized to generate photoelectric current in plasmonic solar cell due to excellent mobility of charge carriers, high absorption cross-sections (105larger than dye), tunable resonance, long life time, and rapid transfer of charges at a three-phase boundary. In dye-sensitized solar cell case, the dye plays a role to increase the available absorption range of light, however, the disadvantage of dye including its limit of operating condition, easier to decomposition and high cost. Basing above shortcomings, the modified graphene is a predominant candidate to replace dye with its tunable band gap, good electronic mobility, and stable chemical property. With these different band structures of graphene, we can apply them on solar cell to improve their efficiency by replacing the dye material. According the above phenomena, it demonstrates graphene plasmonics also has this effect and potential to apply in energy conversion of solar energy in the future. Here we modified graphene to produce surface plasmon. We can use self-assembly monolayer process to let the nano-sized metal particle bonding on the graphene’s surface that can help us to adjust the band structure of graphene to produce surface plasmon resonance. Then metal cluster modified graphene act as a photosensitizer. Furthermore, plasmonic graphene was fabricated on n type semiconductor to generate photoelectric current in water splitting solar hydrogen production.

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